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Theorem nfa2OLD 2154
Description: Obsolete proof of nfa2 2027 as of 18-Oct-2021. (Contributed by Mario Carneiro, 24-Sep-2016.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
nfa2OLD 𝑥𝑦𝑥𝜑

Proof of Theorem nfa2OLD
StepHypRef Expression
1 nfa1 2015 . 2 𝑥𝑥𝜑
21nfal 2139 1 𝑥𝑦𝑥𝜑
Colors of variables: wff setvar class
Syntax hints:  wal 1473  wnf 1699
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034
This theorem depends on definitions:  df-bi 196  df-or 384  df-ex 1696  df-nf 1701
This theorem is referenced by: (None)
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